Delete primary partition
7b29a3cda33e990e8a7877b81988b933 mbr-nondos-mode.img

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Disk <removed>: 20 MiB, 20971520 bytes, 40960 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / <removed> bytes
Disklabel type: dos
Disk identifier: <removed>

Device     Boot Start   End Sectors Size Id Type
<removed>3      12288 40959   28672  14M  5 Extended
<removed>5      26624 30719    4096   2M 83 Linux
<removed>6      14336 18431    4096   2M 83 Linux

Partition table entries are not in disk order.
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